Blunted cortisol rhythm is associated with learning impairment in aged hamsters.

@article{Cain2004BluntedCR,
  title={Blunted cortisol rhythm is associated with learning impairment in aged hamsters.},
  author={Sean W Cain and Ilia N Karatsoreos and Neelam Gautam and Yaroslav Konar and Douglas Funk and Robert J. McDonald and Martin Roland Ralph},
  journal={Physiology & behavior},
  year={2004},
  volume={82 2-3},
  pages={339-44}
}
In mammals, the cognitive decline that accompanies unsuccessful aging is associated with circadian rhythm dysfunction and increased levels of circulating glucocorticoids. The possible causal relations among these factors are not known. To test for primary effects of circadian clock dysfunction versus increased glucocorticoid levels as contributors to age… CONTINUE READING